Preparation and enhanced electric-field-induced strain of textured 91BNT–6BT–3KNN lead-free piezoceramics by TGG method

Optimized strain performance in <001>-textured Bi0.5Na0.5TiO3-based ceramics with ergodic relaxor state and core—shell microstructure

“…However, the textured ceramics exhibit lower ε m and higher T m compared to their nontextured counterparts. The suppressed dielectric constant for the textured ceramics is usually ascribed to their higher pore concentrations [44][45][46], which can be seen in Fig. S2(a) in the ESM.…”

Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

“…The dielectric constant at room temperature (ε 25 • C ) for the randomly-oriented ceramics is about 800, whereas the ε 25 • C for textured ceramics is 810 (at 10 kHz). On the contrary, the maximum dielectric constant ε max of the randomly oriented ceramics is 5350, decreased significantly to~3950 for textured ceramics, where less extrinsic contribution is thought to be the main reason for the depressed dielectric maxima in the textured ceramics, while the higher residual pore concentration in the textured ceramics may also impact the crystallinity and maximum dielectric constant [19,34]. With the ε max decreased, the textured ceramics show temperature stable dielectric behavior over a broad temperature range.…”

“…The T d and T m are found to be~120 • C and~290 • C for the randomly oriented ceramics, respectively, while the textured ceramics are found to possess slightly lower T d (~110 • C) and T m (~270 • C). This phenomenon is attributed to the residual internal stresses from the template grains, a slight composition deviation, and the integrated aging effect in the textured ceramics [19,20,33]. The dielectric constant at room temperature (ε 25 • C ) for the randomly-oriented ceramics is about 800, whereas the ε 25 • C for textured ceramics is 810 (at 10 kHz).…”

“…Of particular importance is that the textured ceramics are low cost compared to their single crystal counterparts [15,16] while exhibiting the anisotropic features similar to single crystal, thus attracting much attention in recent years [16][17][18][19][20][21]. Enhancements in the piezoelectric d 33 value of highly textured piezoelectric ceramics have been reported in <001>-textured NBT-BT [16], NBT-KBT [17], NBT-KBT-BT [18], NBT-BT-KNN [19], and Bi 1/2 Na 1/2 TiO 3 -BaTiO 3 -AgNbO 3 (BNT-BT-AN) [20] ceramics, where the effect of templates on dielectric, piezoelectric, and ferroelectric properties of the textured ceramics were discussed. However, the studies on electrical conductivity are limited, which plays an important role in ferroelectric materials since the poling process is impacted by the nature of conductivity of the materials, thus affecting their piezoelectricity.…”

Topochemical synthesis and structural characteristics of orientation-controlled (Bi0.5Na0.5)0.94Ba0.06TiO3 perovskite microplatelets

“…Zhao et al [18] studied the polar domain structural evolution of 0.94BNT-0.06BT under external fields, while Das Adhikary et al [19] investigated its random lattice strain and relaxation, with both studies revealing the impact of these effects on the structural and electrical properties of the material. Furthermore, textured ceramics of 0.94BNT-0.06BT or similar compositions have been synthesized through templated grain growth via the use of Bi 4 Ti 3 O 12 [20] , SrTiO 3 [21] , BaTiO 3 [22] , BNT [23,24] and NaNbO 3 [25] platelet templates. It was found that the addition of heterogeneous templates causes both lattice mismatch with the matrix and compositional changes in the final ceramics, which can deteriorate the piezoelectric properties, lower the depolarization temperature and thereby cause instability in the final textured ceramics.…”